An instrument for determining the total water content in air when extinguishing fires

Research output: Contribution to journalArticle


n instrument suitable for measuring the total water content both as small liquid droplets and as vapour in the air, in water mist total flooding extinguishing tests, is presented. The instrument consists of a heater and a Vaisala humidity meter. The Vaisala humidity meter is capable of measuring relative humidity at temperatures up to 180°C. The instrument has a measuring range of 0-600g/m3, a sample rate of 1 L/min, a time constant of 5-10 s and an accuracy of ±40 g/m3. Accurate results are obtained when used outside the direct spray from a nozzle. If the instrument is placed in the spray the total water content can be either over- or underdetermined, depending on which part of the instrument faces the spray.


  • Petra Andersson
  • Göran Holmstedt
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Building Technologies
  • Other Civil Engineering
Original languageEnglish
Pages (from-to)187-192
JournalFire and Materials
Issue number4
Publication statusPublished - 1999
Publication categoryResearch

Related research output

Petra Andersson, 1997, Department of Fire Safety Engineering and Systems Safety, Lund University. 260 p.

Research output: ThesisDoctoral Thesis (compilation)

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